SM130 RFID Chip doesn't read tag on startup

Wireless & IoT
1

Hello,

I’m working with the SM130 RFID Chip and am running into a peculiar problem I’d like to try to resolve.

If the arduino and antenna start up while a tag is already on the antenna, the reader has no idea that a tag is sitting there. It won’t notice until I remove the tag, at which point I can get the chip to realize that the chip is gone.

I’m using my own library based off of Sparkfun’s example code: https://www.dropbox.com/sh/1c5xyeq18wmnlo6/CFd6H3nfAr

I’ve tried toggling the antenna power on/off to see if that helps with sensing the tag’s presence, but to no avail. Does anyone have suggestions for how to resolve this?

2

Aaand it turns out that turning the antenna on/off before selecting a tag fixed the problem. My first attempt at implementing it just didn’t work right… but it’s fixed now!

3

Quick question. I’m trying to use your library, but when I try to compile your example, I get the following

  This report would have more information with
  "Show verbose output during compilation"
  enabled in File > Preferences.
Arduino: 1.0.5-r2 (Windows NT (unknown)), Board: "Arduino Uno"
read_tags.ino: In function 'void setup()':
read_tags:11: error: 'class SM130' has no member named 'connect'
read_tags.ino: In function 'void loop()':
read_tags:15: error: 'class SM130' has no member named 'seek_tag'
read_tags:17: error: 'class SM130' has no member named 'parse_response'
read_tags:18: error: 'class SM130' has no member named 'set_flag'
read_tags:19: error: 'class SM130' has no member named 'print_serial'

Any idea why this isn’t working for me? Thanks for any help.